What The @#$%&! (Heck) is this #! (Hash-Bang) Thingy In My Bash Script

Mitch Frazier — Fri, 10 May 2019 11:30:00 +0000

You've seen it a million times—the hash-bang (#!) line at the top of a script—whether it be Bash, Python, Perl or some other scripting language. And, I'm sure you know what its purpose is: it specifies the script interpreter that's used to execute the script. But, do you know how it actually works? Your initial thought might be that your shell (bash) reads that line and then executes the specified interpreter, but that's not at all how it works. How it actually works is the main focus of this post, but I also want to introduce how you can create your own version of "hash-bang" if you're so inclined.

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Bash binfmt binfmt_misc

What The @#$%&! (Heck) is this #! (Hash-Bang) Thingy In My Bash Script